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作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract At the end of the 19th century, the largest telescope in operation was a refractor 40 inches in diameter. It ruled for a few years into the 20th century, when it was surpassed by the 60—inch refl ector—called the first “modern” telescope—of Mt. Wilson Obse...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract William Herschel was the first astronomer to push his investigation beyond the Solar System and to expressly concern himself with the stars and nebulae—the “construction of the heavens.” We now know that it was actually his sister, Caroline, who preceded him an...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract It is now common knowledge that the Milky Way is a vast spiral star system which we view edgewise from just outside one of the spiral arms. Th e first clear demonstration of the fact, by Yerkes Observatory astronomer William Wilson Morgan, occurred only in 1951. Th ...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract As noted in previous chapters, the discovery of the universe of galaxies was accomplished through slow but steady progress. However, since 1945 the pace of change in understanding galaxies has increased at a rapid rate. In the earlier days, as we have been discussin...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract In the previous chapter we outlined the story of how galaxies have likely assembled into the forms we see in the modern universe. Th is formation is largely based on observational properties of these systems that allow us to construct how these galaxies were put together...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract One of the noteworthy features of Hubble’s law is that, with the exception of the static universe with which Einstein and de Sitter began in 1917, it is the only redshift distance law that is isotropic and homogeneous (i.e., looks the same) for every galaxy in the u...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract The Milky Way consists of 100,000 million stars. It appears sedate, placid, unchanging as it curves, a river of stars across the bowl of the night-sky. We know, however, that it is a dynamic structure; it must have had a violent youth in which it was cobbled together fro...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract Far from city lights, the view of the night sky is dominated by stars. Th ey seem to be present in countless numbers. It comes as a surprise to learn that with the naked eye only about three thousand are visible at any given time. Most of these lie within a hundred, and ...
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract Among Galileo’s most momentous discoveries was his demonstration that Milky Way’s river of light consists of a host of small stars. It is a discovery that can be repeated by anyone with a dark sky site and an ordinary pair of field glasses.
作者:William Sheehan , Christopher J. Conselice
来源:[B].Springer New York2015Springer
摘要:Abstract Friedrich Wilhelm Herschel—or William Herschel as he naturalized his name aft er moving to England—was the great pioneer of stellar astronomy and the nebulae in the 18th century. At the time he began, the nebulae—catalogued by Messier only to save time in elimi...

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